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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b8c6413d0040f7aebb354d837e6f1cfff1fc27c791079c2a0f8d15779bc35f5' 
  AND token = 'xCzQYGaIGl+y451/4yDFSyRUT2k5h/GXn+2X5CbrDDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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