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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7515482ea61b46c48a7caa1456615c85305a14918d333390370c9b4ab0372d5' 
  AND token = 'HrOPtBXqoFM8RySO0/W4Wfy+ZVKE8NPjMD0Nm2k5960=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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