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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '811fa7209ff3ec0ce1ee0b4a0ad1946311ac9bfce746f6a1d7a48f0c050922ca' 
  AND token = 'UwZHheYBETVxaGxhI6fPBVjL81s4kDAI7aochgow8ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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