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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3f5a8e5314a03ca7b54687c7503ed0ce51a18df1f3e4a4e10428874b852326f5' 
  AND token = 'w2oc6e3L98bCGUbNKwKazsPwWr9W/hTp/fqbAkFK+rM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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