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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da4ce6a6aab11cd970d37f0defaa37268b0594175631352da6d4ca57d59bee52' 
  AND token = 'hnzKP+3WdgldfF/BcD83tsih/nG4+n7mo2iSjpy240o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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