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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e97edcd16028d081a19a233d322ab728d3aafe79453d677f28050a2837b717bf' 
  AND token = 'f5Go6rGpsplp2hZc7JTyMSDhkEZnygxtW0us/6KWQzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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