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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2fab5d2814b99dce3ed3d88683f6884cfc090c34e7de8b871e4994fc4cf47ce' 
  AND token = '+Kb4EB7K8hG5wsnqpGncDU8Bg6xaQEP+ndtC78Rkp4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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