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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ce41bcd38d570ec432301e574c97f04dd29e331a31fac56f54bd177f9ca0e91' 
  AND token = 'EDmkivfufiBeIN08f/SG/q27ay2naPIpn0J6UbpynqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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