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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6b8045957b8bea772b41dd3dd7dbb21bf605d8b2c5bfd091e401a8c350afa14' 
  AND token = '69tVADdRjgFRXcKZCAvBBI1AkBLeLPPXNys79ixxZLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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