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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b176643269904a4bad72fb2c58f2e00b05bb651679a424adba63ff55f01863f8' 
  AND token = '19gEYkX++Qv7Yo3/3LrirGaihNo3xFAlatB/EULnp7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}