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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '75523f53a37ed8709890b3904fe38f7ad9a440fc94f3da333b71ccf117db1c7e' 
  AND token = 'Wh5XQuJOLbXROlUw94FDCYrUA8Mmx43f8bW1TCJj0wo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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