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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac05273246c7d8c04075734ca588af94b0c89409d2acdd6e63acd22b55c222b0' 
  AND token = 'KEU83hE2WLql2Rd3sbNneXNVfld8TqI+yMmkVVVI+28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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