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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a10e1526e2769bb1c154bcf1d72fbe927ed5b8d71e34faadf5905f9192e4f93' 
  AND token = '1XDob0cJo68y6ND7a1LRd6L3nfVACOZzPzhORoqO5D8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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