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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20aa022b47050b63482982d07dacd609c5e499296f0c1cf4299f988b41dd82e3' 
  AND token = 'Yn5i/vg+QNL3b3qkfKhvXQu5xP4sN7niTFJk/LbbpoY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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