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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61d1e9c1d0c067bf883ecd537100db83b76b18f13c3f41a35920f29fc3baeac6' 
  AND token = 'e6KOwIRcWCuK8SHpZoUOwmQW1QmQr1uOdb5NUqvT35g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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