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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3f20d335201b2c5143783796e32f6f859da4afe1efbdfc4f003fa7b2163f6e4' 
  AND token = '/N/vn36r5lZ5FmwiXUN/28iEggv5NrTQC9iQVfUSk38=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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