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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a02ad07a5a6e0a5a25192922f8e4580d95d08e256971c6048b40b8ee19ede7d1' 
  AND token = 'YdpDZiHVbbrFIw4pAOS6Bs/jVTl7KgU4LqChbM0yzcY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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