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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e150d68206d7251858e57d5bd703ca85bc7f72abbbb7f98dd5f76b6eb364791' 
  AND token = 'sBehHM012rj4kAOSVDQ0my6is44ZkTLLfteQLSAgfT4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00068

JSON explain

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