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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb2cb5421f5243ceaa608f7360b8a54445a72e8ad759fcf78028ec518de227ad' 
  AND token = '99bp6DmhTWj2sAM4/TkTGhMJo0x7Qne9xioORKbf4fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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