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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8db37a5b26aacc9c4f65ee94720bb1164e744180c08416fd4df6ec360dea842a' 
  AND token = 'InzmHIWH2B7e9m9yYAsTVgV2jjZCecpfE3He6ATvC/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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