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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b97e7e7eed5f4041fd868ed72a66ed5c7477ee66cc14443ca506570f59ada2a2' 
  AND token = 'MvGxldJ7bIEq1k1qzFW+qa066k9p7CA35OQna2sS6vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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