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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e3911731a882b00c91cbd69ca19fd1fa264852e492f83690131566d5bc68fa1' 
  AND token = 'X98yswMUEq7TwWydqE0T0cS1DveZ9wTLz2ffWBSUzLg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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