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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b70ed2df62d5f7dbe61787524f09c88e0d42a7ebff5e722e4bcf8e7c7ee449a4' 
  AND token = '359rnaFAiiJkiJmjG6RpPk5oo2OKf4PYqyIs9yk4S6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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