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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca608c87bed3e18af1a142a73679c0f6487ea1fede7add5ff130c903dc3f37bf' 
  AND token = '5vtaKXCkv8MpftOEF7+yLjgp8X30UsUvSv1ZLJY8nZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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