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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf98472653afe53c736e7f1bbbbbb557d0e1b90417fb4e58fb49d60eed55b0f1' 
  AND token = 'DPAK+G3/3RDGDMo3GA5nmFmCZAtE1qIKo9Fh5kJjVr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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