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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3da60aa0b9def9769a99f5b9e814147fa82e247e186f55a8f43376609c385c93' 
  AND token = 'kpYO3mkXhq4st4A9VrApukwkV2RhPLMIPh03Oe6iJmc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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