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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dad17b3e58f516604c49cfbf802c023115b10b7f877b2c1f05bac8170403d77f' 
  AND token = 'PHuWtvAGANXYqdsTVyFfDNkgE6WivuSWjCZy6f5zlf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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