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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f9539ad8c515894dbd92068d486fdd57e3bc41e2014d82cefd16180636705c74' 
  AND token = 'WS1gfQns1ZVP4N6EbiKbHDNZ7FnU7p+aHRiW9pUnuNI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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