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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1b75a3bf03550b0341939f6b552699a43c517beb9d00e17a8bc945b03f32565' 
  AND token = 'I9TeEKqkfv1Tc5aqZC+eGw9hLNvMpV/S0UL+QTOUeKo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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