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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fed0cdce9669e123a8da45663c2cd8b6862080e6056a3b1d25e6b37d0adddb2' 
  AND token = '2MNwYG6KC2SYoW1Le9vyrQ8so5XgLPLmQi3U+v0XiN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00307

JSON explain

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