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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8730874efb97446d84ffc76d83bc87cc4cba91fa2ae450dc7e99db8d1f9f0a8b' 
  AND token = 'Z7v+lGkguC46+pE+gfTj/C+1UDj+bBuo5C3TAj5SPLo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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