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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '028593eeba62dadc3d8ef5f036018db41de6872ba490d149da9538dbf5f1b77e' 
  AND token = '7UAmUE7NSlPO4GMxi7plx20/LfUr2AkECdSLpBKGa1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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