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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30cd064d09d38d2591ee1ffdfa31eef37e32cca297d6dab5d558d3a386f0c7b7' 
  AND token = 'T2PUVqmImlTb6jUShVSjb3W7QYbiPpGiVWlbhUkiP/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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