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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df7dea58a53c92f4b8766590aa18a685d89d5d7ad6f510409c5fab26c4115107' 
  AND token = 'JDSWG7dlAbwaGgLVEetikeXHCLQZOJJsAh+B7ffXCeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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