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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b95b98206db4bd31719f2bf240edcc26481777a3ab78b71a9f7f6d3d8585903' 
  AND token = 'Uq2MIYskD3mWHSmfsEhChPeWT5kmMZvFQTuN21h3Jws=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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