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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fefd80eb908a034bb509b7f9632ebc27f869f5361d55c90fd53d120fe933229' 
  AND token = '6oLTztuYTRHFP0iB4dd6ASc/m6kYxtJeT7YOfqNEQTU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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