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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a6c3e16f13275176b1bb879fca9b5193ec17d341bceeff8ff202327e3fd4412' 
  AND token = 'u5vBcnT4se3jGUIw07HHXpINIofDf/+eHb6PI0JbhOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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