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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0134d0276321ca6763ec82ffcb0433944bbbd181d6ec371fde263bd682ddb40' 
  AND token = '2owSKH22QjZ/JztHiil28q38CBPu3Z2OnJgW0Tzm2mE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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