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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd31d2a7cc4b4c6da409846e6fb58dee5a8e88eacd28253074676d1d2c6bb0a5f' 
  AND token = '7qsQ2ItehEt3l8OSJBe3Anbt1Cw0urZxaU7Jhc4VdJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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