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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf8cc4a76a782383cd580d1a81b2ef5272562082683cd88f0ab263e7f42989c' 
  AND token = 'tshsshVc+8kq9tZfDjzWk/N0Jfy3Ke8yC5bHUDer1T0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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