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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fcec5e5ee2c3e72602e75b3c30bb4ef108c1f77376514dca248f26b2889ff58' 
  AND token = 'tqFX0gV3EooagaJfCQwSchQCp/diuw1MU2TjKRxHU40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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