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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a13fe46b5a19c6702e90af2637f94fd2d3d93c9587f2af8c7f138880dc84cd5' 
  AND token = 'H5FfLoJaYjcBJuOOn1G9/mYkmX8Xo05Xr1HlpMXREDk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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