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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feda1c1a862b90f3d53439d950d21b49a2b32bba689af5ddfff98c0f07ed1d88' 
  AND token = 'ESITls4dnVUMYRd6UUxQVb55Zj89UmLFSE3f6YEyVAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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