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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f06b8d06a1576c667616e3c5d69c3830c3c17e9f904f4ed37981e0a9b4178cb6' 
  AND token = 'pSO7AXlxNxiFKSxoUZ32gPb5SUuD571fxflzuuAkOd8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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