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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ace42faf6b988e32dca5de25bd9b919535136b2b65f3e68868bb281bf9901a' 
  AND token = 'WLD5EoIky0YVuEAXIgGkTS8e3U4byfQsnpk3c/C/LFA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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