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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd8778fc4951fc83ccb7556bd676397f62c5421f7673b33ef276e4cd794ed849' 
  AND token = '11kGDyEHO5yIx9Hl2bp2Nvkou7T11oizNosmOFY2miw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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