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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0a6c5b95fdab948929600b0de590ddedf36b3892af05c1e1a65a2e2fffca80ad' 
  AND token = 'BxE2rGxa7WpCfiqIciEtlYC7lSunX4bnC7m2sR7OUMw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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