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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b5f99b36c967d86f8d643e6ab038a4d2ae6b13904b2a462184b7a20ede24e64' 
  AND token = 'ZphoqFjznbPhTp50jY1x/P7yyGV5hhQrbzH0+LN6zFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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