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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cebe81f038f46f74efe2e2c3f4f2f1ed6f68c5e09436a8dc7b825183555858a' 
  AND token = 'm301Y33zrgmHUYWmWI0x/Psz1dKVgttgB9wxX7Uf3Zs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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