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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0278280a621120c6d53bb768f2c40a73581ee0e35a5615eb41c5678ca7919566' 
  AND token = 'hLcyik5Sf4Ogo/63O6PiECL+q2v1wLMsm91VB5Qyc70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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