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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bbd9589bb3d580d10287645bad288840f821c86e764d161722fcf0cace792c64' 
  AND token = 'pehwzHNXgu3BoPyAxwMNMAiIC/uisF2gNn5KXcYlUTc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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