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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fc9c49765de5eb3e81b16158c73d3a554261606d3205af6fd8dfe8cb3e9d56f' 
  AND token = '0kHDD8nw31OLAbz8NDJiofQ7zqASdBawnAfeN88Qjqg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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