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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc770b1c9e3ae0e8ef145a6d91f8f0f8cb8256ec2f5790418d09f13a87da139c' 
  AND token = 'Ik6YZTAk3N3ecuR1wUe9hTNS3KSe7k1h14DKEqX2Tbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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