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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '93085446e7b2b59adbc94487b7942959aadd296b6e046de2d7e24fc22ef05b33' 
  AND token = 'wxQ1TpPXnmHsD1fWXMKVWDTJLf7Ne5x1ot+o4f/5xSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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