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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1ea18e92d339ef481c26f2cfa4fa1cf3605a60fc9ad1b58fa848f9a8586ed2c0' 
  AND token = '2gYictldMKFHKmdkSmreQZPNhhX7mcGHOS6G16FmBkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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