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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c9c4fa1413bb1d4b06fa7fa3b73022f78ec1094b28a5b7e8bce79d944618ce7' 
  AND token = '4N5S/ADPvdyOK4XrT9U8/v6PRrcoy60z0Ga+gep9wPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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