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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82b6359e1e358c0eb05634445befabfd630c2205c4e5ece61f2691375fa27a0d' 
  AND token = 'qViAyQtj8RsnjwL1ENjnr5esDUN5RbbNjZqdT4SHLvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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