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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b9af3c7d89f3d057d14b29da2b4fd2d1977fdd4e001fd7e182fa363db07dadc2' 
  AND token = '9wOg6t8LeFC70GpK4URmfoy1nHDCHFqHOpwKD0aQjQc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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