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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '764c6fb3ad867d772cdb324409b40aa0e3c771c43121afe80015fe3788c666a8' 
  AND token = '6IJCLzUNpLKW5iQ4PD8glo3/pgqILO+oECdDXHAYf7M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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